package org.example;

import com.mysql.cj.jdbc.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.MessageFormat;
import java.util.Scanner;

public class Demo03_DataSoure {
    public static void main(String[] args) {
        //定义mysql数据库对象
        MysqlDataSource mysqlDataSource = new MysqlDataSource();

        //设置数据库连接串
        mysqlDataSource.setURL("jdbc:mysql://127.0.0.1:3306/java113?characterEncoding=utf8" +
                "&allowPublicKeyRetrieval=true&useSSL=false");
        //用户名
        mysqlDataSource.setUser("root");
        //密码
        mysqlDataSource.setPassword("123456");
        //定义JDBC的数据源对象
        DataSource dataSource = mysqlDataSource;


        //定义连接对象
        Connection connection = null;

        //定义预处理sql执行对象
        PreparedStatement preparedStatement = null;

        //定义结果集对象
        ResultSet resultSet = null;

        try {
            //1.通过数据源对象获取数据库连接
            connection = dataSource.getConnection();
            //2.获取处理sql执行对象
            //定义执行sql
            String sql =  "select student_id, sn,name,mail,class_id from student where name = ?";
            preparedStatement = connection.prepareStatement(sql);

            //接收用户的输入
            System.out.println("请输入学生姓名:");
            Scanner scanner = new Scanner(System.in);
            String name = scanner.next();


            //3.用真实值替换占位符
            preparedStatement.setString(1,name);

            //4.执行sql获取结果集
             resultSet = preparedStatement.executeQuery();

            //5.遍历结果集
            while (resultSet.next()){//如果下一条有记录返回true，没有则返回false
                //获取学生id
                long stuId = resultSet.getLong(1);
                String stuSn = resultSet.getString(2);
                String stuName = resultSet.getString(3);
                String stuMail = resultSet.getString(4);
                long classId = resultSet.getLong(5);
                System.out.println(MessageFormat.format("学生编号={0}, 学号={1}, 学生姓名={2}, 邮箱={3}, 班级编号={4}", stuId, stuSn,
                        stuName, stuMail, classId));

            }

        } catch (SQLException e) {
            throw new RuntimeException(e);
        }finally {
            if(resultSet != null){
                try {
                    resultSet.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
            if(preparedStatement != null){
                try {
                    preparedStatement.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
            if(connection != null){
                try {
                    connection.close();
                } catch (SQLException e) {
                    throw new RuntimeException(e);
                }
            }
        }
    }
}
